Title

Effect Of Aspect Ratio On Inertial Migration Of Neutrally Buoyant Spheres In A Rectangular Channel

Abstract

A suspension of particles in a fluid under motion in a channel is a class of flows in which the particle-particle, particle-wall and particle-fluid interactions are important. In this study, inertial migration of spherical particles is studied for three-dimensional rectangular channels with different aspect ratios for the channel cross-section using the lattice Boltzmann method. The particles are neutrally buoyant in nature, and the Reynolds number, defined as Re=ρHUavg/ μ, based on the average velocity of the Poiseuille flow and the shortest dimension of the channel, is varied between 100 to 500. Channels of aspect ratios from 1 to 4 have been used for modeling the geometry. The particle size to the smallest dimension of the channel ratio is taken to be 1/10 and the particle concentration is less than 0.5% for all cases simulated. Simulations show that these particles migrate to preferred locations in the channel, known as equilibrium locations, and these depend on Re and aspect ratio of the channel. For aspect ratio 2 and higher, particles form an inner ring that moves away from the wall as Re is increased. An outer ring is formed, which moves closer to the walls as Re is increased. The location of these inner and outer rings is strongly dependent on the Reynolds number of the flow. Copyright © 2009 by the American Institute of Aeronautics and Astronautics, Inc.

Publication Date

1-1-2009

Publication Title

47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.2514/6.2009-1022

Socpus ID

78549232699 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/78549232699

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